From: andrey.konovalov@linux.dev To: Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Andrew Morton <akpm@linux-foundation.org> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, Peter Collingbourne <pcc@google.com>, Evgenii Stepanov <eugenis@google.com>, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH mm v3 24/38] kasan, vmalloc: add vmalloc tagging for SW_TAGS Date: Mon, 13 Dec 2021 22:54:20 +0100 [thread overview] Message-ID: <190297aa8e648b25a6015cd9e15a477b720282ba.1639432170.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1639432170.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Add vmalloc tagging support to SW_TAGS KASAN. - __kasan_unpoison_vmalloc() now assigns a random pointer tag, poisons the virtual mapping accordingly, and embeds the tag into the returned pointer. - __get_vm_area_node() (used by vmalloc() and vmap()) and pcpu_get_vm_areas() save the tagged pointer into vm_struct->addr (note: not into vmap_area->addr). This requires putting kasan_unpoison_vmalloc() after setup_vmalloc_vm[_locked](); otherwise the latter will overwrite the tagged pointer. The tagged pointer then is naturally propagateed to vmalloc() and vmap(). - vm_map_ram() returns the tagged pointer directly. Enabling KASAN_VMALLOC with SW_TAGS is not yet allowed. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- Changes v2->v3: - Drop accidentally added kasan_unpoison_vmalloc() argument for when KASAN is off. - Drop __must_check for kasan_unpoison_vmalloc(), as its result is sometimes intentionally ignored. - Move allowing enabling KASAN_VMALLOC with SW_TAGS into a separate patch. - Update patch description. Changes v1->v2: - Allow enabling KASAN_VMALLOC with SW_TAGS in this patch. --- include/linux/kasan.h | 16 ++++++++++------ mm/kasan/shadow.c | 6 ++++-- mm/vmalloc.c | 14 ++++++++------ 3 files changed, 22 insertions(+), 14 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index da320069e7cf..92c5dfa29a35 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -424,12 +424,13 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end); -void __kasan_unpoison_vmalloc(const void *start, unsigned long size); -static __always_inline void kasan_unpoison_vmalloc(const void *start, - unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size); +static __always_inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) { if (kasan_enabled()) - __kasan_unpoison_vmalloc(start, size); + return __kasan_unpoison_vmalloc(start, size); + return (void *)start; } void __kasan_poison_vmalloc(const void *start, unsigned long size); @@ -454,8 +455,11 @@ static inline void kasan_release_vmalloc(unsigned long start, unsigned long free_region_start, unsigned long free_region_end) { } -static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size) -{ } +static inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) +{ + return (void *)start; +} static inline void kasan_poison_vmalloc(const void *start, unsigned long size) { } diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 39d0b32ebf70..5a866f6663fc 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -475,12 +475,14 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, } } -void __kasan_unpoison_vmalloc(const void *start, unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size) { if (!is_vmalloc_or_module_addr(start)) - return; + return (void *)start; + start = set_tag(start, kasan_random_tag()); kasan_unpoison(start, size, false); + return (void *)start; } /* diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 42406c53e2a5..837ed355bfc6 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2208,7 +2208,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node) mem = (void *)addr; } - kasan_unpoison_vmalloc(mem, size); + mem = kasan_unpoison_vmalloc(mem, size); if (vmap_pages_range(addr, addr + size, PAGE_KERNEL, pages, PAGE_SHIFT) < 0) { @@ -2441,10 +2441,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, return NULL; } - kasan_unpoison_vmalloc((void *)va->va_start, requested_size); - setup_vmalloc_vm(area, va, flags, caller); + area->addr = kasan_unpoison_vmalloc(area->addr, requested_size); + return area; } @@ -3785,9 +3785,6 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, for (area = 0; area < nr_vms; area++) { if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area])) goto err_free_shadow; - - kasan_unpoison_vmalloc((void *)vas[area]->va_start, - sizes[area]); } /* insert all vm's */ @@ -3800,6 +3797,11 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, } spin_unlock(&vmap_area_lock); + /* mark allocated areas as accessible */ + for (area = 0; area < nr_vms; area++) + vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr, + vms[area]->size); + kfree(vas); return vms; -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: andrey.konovalov@linux.dev To: Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Andrew Morton <akpm@linux-foundation.org> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, Peter Collingbourne <pcc@google.com>, Evgenii Stepanov <eugenis@google.com>, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH mm v3 24/38] kasan, vmalloc: add vmalloc tagging for SW_TAGS Date: Mon, 13 Dec 2021 22:54:20 +0100 [thread overview] Message-ID: <190297aa8e648b25a6015cd9e15a477b720282ba.1639432170.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1639432170.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Add vmalloc tagging support to SW_TAGS KASAN. - __kasan_unpoison_vmalloc() now assigns a random pointer tag, poisons the virtual mapping accordingly, and embeds the tag into the returned pointer. - __get_vm_area_node() (used by vmalloc() and vmap()) and pcpu_get_vm_areas() save the tagged pointer into vm_struct->addr (note: not into vmap_area->addr). This requires putting kasan_unpoison_vmalloc() after setup_vmalloc_vm[_locked](); otherwise the latter will overwrite the tagged pointer. The tagged pointer then is naturally propagateed to vmalloc() and vmap(). - vm_map_ram() returns the tagged pointer directly. Enabling KASAN_VMALLOC with SW_TAGS is not yet allowed. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- Changes v2->v3: - Drop accidentally added kasan_unpoison_vmalloc() argument for when KASAN is off. - Drop __must_check for kasan_unpoison_vmalloc(), as its result is sometimes intentionally ignored. - Move allowing enabling KASAN_VMALLOC with SW_TAGS into a separate patch. - Update patch description. Changes v1->v2: - Allow enabling KASAN_VMALLOC with SW_TAGS in this patch. --- include/linux/kasan.h | 16 ++++++++++------ mm/kasan/shadow.c | 6 ++++-- mm/vmalloc.c | 14 ++++++++------ 3 files changed, 22 insertions(+), 14 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index da320069e7cf..92c5dfa29a35 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -424,12 +424,13 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end); -void __kasan_unpoison_vmalloc(const void *start, unsigned long size); -static __always_inline void kasan_unpoison_vmalloc(const void *start, - unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size); +static __always_inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) { if (kasan_enabled()) - __kasan_unpoison_vmalloc(start, size); + return __kasan_unpoison_vmalloc(start, size); + return (void *)start; } void __kasan_poison_vmalloc(const void *start, unsigned long size); @@ -454,8 +455,11 @@ static inline void kasan_release_vmalloc(unsigned long start, unsigned long free_region_start, unsigned long free_region_end) { } -static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size) -{ } +static inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) +{ + return (void *)start; +} static inline void kasan_poison_vmalloc(const void *start, unsigned long size) { } diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 39d0b32ebf70..5a866f6663fc 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -475,12 +475,14 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, } } -void __kasan_unpoison_vmalloc(const void *start, unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size) { if (!is_vmalloc_or_module_addr(start)) - return; + return (void *)start; + start = set_tag(start, kasan_random_tag()); kasan_unpoison(start, size, false); + return (void *)start; } /* diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 42406c53e2a5..837ed355bfc6 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2208,7 +2208,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node) mem = (void *)addr; } - kasan_unpoison_vmalloc(mem, size); + mem = kasan_unpoison_vmalloc(mem, size); if (vmap_pages_range(addr, addr + size, PAGE_KERNEL, pages, PAGE_SHIFT) < 0) { @@ -2441,10 +2441,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, return NULL; } - kasan_unpoison_vmalloc((void *)va->va_start, requested_size); - setup_vmalloc_vm(area, va, flags, caller); + area->addr = kasan_unpoison_vmalloc(area->addr, requested_size); + return area; } @@ -3785,9 +3785,6 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, for (area = 0; area < nr_vms; area++) { if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area])) goto err_free_shadow; - - kasan_unpoison_vmalloc((void *)vas[area]->va_start, - sizes[area]); } /* insert all vm's */ @@ -3800,6 +3797,11 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, } spin_unlock(&vmap_area_lock); + /* mark allocated areas as accessible */ + for (area = 0; area < nr_vms; area++) + vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr, + vms[area]->size); + kfree(vas); return vms; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-12-13 21:54 UTC|newest] Thread overview: 128+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-13 21:51 [PATCH mm v3 00/38] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 01/38] kasan, page_alloc: deduplicate should_skip_kasan_poison andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 02/38] kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 03/38] kasan, page_alloc: merge kasan_free_pages into free_pages_prepare andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 04/38] kasan, page_alloc: simplify kasan_poison_pages call site andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-16 12:54 ` Alexander Potapenko 2021-12-16 12:54 ` Alexander Potapenko 2021-12-13 21:51 ` [PATCH mm v3 05/38] kasan, page_alloc: init memory of skipped pages on free andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 06/38] kasan: drop skip_kasan_poison variable in free_pages_prepare andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 07/38] mm: clarify __GFP_ZEROTAGS comment andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 08/38] kasan: only apply __GFP_ZEROTAGS when memory is zeroed andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:51 ` [PATCH mm v3 09/38] kasan, page_alloc: refactor init checks in post_alloc_hook andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-16 13:32 ` Alexander Potapenko 2021-12-16 13:32 ` Alexander Potapenko 2021-12-13 21:51 ` [PATCH mm v3 10/38] kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook andrey.konovalov 2021-12-13 21:51 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 11/38] kasan, page_alloc: combine tag_clear_highpage calls in post_alloc_hook andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-16 13:04 ` Alexander Potapenko 2021-12-16 13:04 ` Alexander Potapenko 2021-12-13 21:53 ` [PATCH mm v3 12/38] kasan, page_alloc: move SetPageSkipKASanPoison " andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 13/38] kasan, page_alloc: move kernel_init_free_pages " andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-16 11:00 ` Alexander Potapenko 2021-12-16 11:00 ` Alexander Potapenko 2021-12-13 21:53 ` [PATCH mm v3 14/38] kasan, page_alloc: simplify kasan_unpoison_pages call site andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 15/38] kasan: clean up metadata byte definitions andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-16 10:52 ` Alexander Potapenko 2021-12-16 10:52 ` Alexander Potapenko 2021-12-13 21:53 ` [PATCH mm v3 16/38] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 17/38] kasan, x86, arm64, s390: rename functions for modules shadow andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 18/38] kasan, vmalloc: drop outdated VM_KASAN comment andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-16 10:53 ` Alexander Potapenko 2021-12-16 10:53 ` Alexander Potapenko 2021-12-13 21:53 ` [PATCH mm v3 19/38] kasan: reorder vmalloc hooks andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-16 10:55 ` Alexander Potapenko 2021-12-16 10:55 ` Alexander Potapenko 2021-12-13 21:53 ` [PATCH mm v3 20/38] kasan: add wrappers for " andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:53 ` [PATCH mm v3 21/38] kasan, vmalloc: reset tags in vmalloc functions andrey.konovalov 2021-12-13 21:53 ` andrey.konovalov 2021-12-13 21:54 ` [PATCH mm v3 22/38] kasan, fork: reset pointer tags of vmapped stacks andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-13 21:54 ` [PATCH mm v3 23/38] kasan, arm64: " andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-13 21:59 ` Andrey Konovalov 2021-12-13 21:59 ` Andrey Konovalov 2021-12-14 13:25 ` Catalin Marinas 2021-12-14 13:25 ` Catalin Marinas 2021-12-13 21:54 ` andrey.konovalov [this message] 2021-12-13 21:54 ` [PATCH mm v3 24/38] kasan, vmalloc: add vmalloc tagging for SW_TAGS andrey.konovalov 2021-12-13 21:54 ` [PATCH mm v3 25/38] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-14 17:11 ` Catalin Marinas 2021-12-14 17:11 ` Catalin Marinas 2021-12-14 18:27 ` Andrey Konovalov 2021-12-14 18:27 ` Andrey Konovalov 2021-12-14 19:27 ` Catalin Marinas 2021-12-14 19:27 ` Catalin Marinas 2021-12-20 21:38 ` Andrey Konovalov 2021-12-20 21:38 ` Andrey Konovalov 2021-12-13 21:54 ` [PATCH mm v3 26/38] kasan, vmalloc: don't unpoison VM_ALLOC pages before mapping andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-16 19:07 ` Alexander Potapenko 2021-12-16 19:07 ` Alexander Potapenko 2021-12-20 21:35 ` Andrey Konovalov 2021-12-20 21:35 ` Andrey Konovalov 2021-12-13 21:54 ` [PATCH mm v3 27/38] kasan, page_alloc: allow skipping unpoisoning for HW_TAGS andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-13 21:54 ` [PATCH mm v3 28/38] kasan, page_alloc: allow skipping memory init " andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-14 18:00 ` Marco Elver 2021-12-14 18:00 ` Marco Elver 2021-12-14 18:28 ` Andrey Konovalov 2021-12-14 18:28 ` Andrey Konovalov 2021-12-17 1:50 ` Kuan-Ying Lee 2021-12-17 1:50 ` Kuan-Ying Lee 2021-12-20 21:35 ` Andrey Konovalov 2021-12-20 21:35 ` Andrey Konovalov 2021-12-13 21:54 ` [PATCH mm v3 29/38] kasan, vmalloc: add vmalloc tagging " andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-14 19:55 ` Marco Elver 2021-12-14 19:55 ` Marco Elver 2021-12-14 22:08 ` Andrey Konovalov 2021-12-14 22:08 ` Andrey Konovalov 2021-12-14 21:03 ` Marco Elver 2021-12-14 21:03 ` Marco Elver 2021-12-13 21:54 ` [PATCH mm v3 30/38] kasan, vmalloc: don't tag executable vmalloc allocations andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-14 19:42 ` Andrey Konovalov 2021-12-14 19:42 ` Andrey Konovalov 2021-12-13 21:54 ` [PATCH mm v3 31/38] kasan, arm64: " andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-13 21:59 ` Andrey Konovalov 2021-12-13 21:59 ` Andrey Konovalov 2021-12-17 13:45 ` Catalin Marinas 2021-12-17 13:45 ` Catalin Marinas 2021-12-13 21:54 ` [PATCH mm v3 32/38] kasan: mark kasan_arg_stacktrace as __initdata andrey.konovalov 2021-12-13 21:54 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 33/38] kasan: simplify kasan_init_hw_tags andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 34/38] kasan: add kasan.vmalloc command line flag andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 35/38] kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 36/38] arm64: select KASAN_VMALLOC for SW/HW_TAGS modes andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 37/38] kasan: documentation updates andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov 2021-12-13 21:55 ` [PATCH mm v3 38/38] kasan: improve vmalloc tests andrey.konovalov 2021-12-13 21:55 ` andrey.konovalov
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